Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A mysterious castle built as a monument to lost love.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The shiny silver little brother to Copenhagen's Little Mermaid statue.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

Old Danish castle immortalized in Shakespeare's Hamlet.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

Copenhagen's celebrated theme park and gardens.

Featured in one of the most iconic scenes in cinema history.

The deepest metro station in the world.

This stoic bronze soldier stands as a symbol of Russian sacrifice or Soviet oppression, or maybe both.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

This dizzying tower was built to better broadcast the 1980 Moscow Olympics.

The Guardian of Tallinn.

See an anatomy teaching collection assembled in the 1920s and 1930s.

The reconstruction of this prominent building fulfilled a long-written command.

A black cat protests the City Guild in Riga's Old Town.

Flamboyant architecture from the turn of 20th century.

The oldest housing complex in Riga is a mini timeline of architectural trends.

3,000 market stands in five former Zeppelin hangars.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.